Autopurge doesn't work

Hi,love your work, so keep it up!

I used the autopurge option on a session before and it was working, set at daily. Currently it won't function, so all logged points remain. I deleted the session and made another one and tested the autopurge setting, but still it won't deleted any points. No errors are logged.

Currently running Nextcloud 15.0.8 and Phonetrack 0.5.1 Running Debian 9.9, apache 2.4.25 and postgresql 9.6.13